WO2001022448A1 - Mouldable material and method for producing a weakly magnetic composite material therewith - Google Patents
Mouldable material and method for producing a weakly magnetic composite material therewith Download PDFInfo
- Publication number
- WO2001022448A1 WO2001022448A1 PCT/DE2000/003054 DE0003054W WO0122448A1 WO 2001022448 A1 WO2001022448 A1 WO 2001022448A1 DE 0003054 W DE0003054 W DE 0003054W WO 0122448 A1 WO0122448 A1 WO 0122448A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- molding compound
- compound
- lubricant
- powder
- thermoplastic
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/22—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
- H01F1/24—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
- H01F1/26—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated by macromolecular organic substances
Definitions
- the invention relates to a molding compound and a method for producing a soft magnetic composite material with such a molding compound, according to the preamble of the independent claims.
- Soft magnetic composite structures are required for the production of temperature, corrosion and solvent resistant magnetic components, especially in electromechanics. These soft magnetic composites or the components manufactured with them require certain properties: They should have a high magnetic
- thermosetting resins for example epoxies or phenolic resins.
- the molding compound according to the invention and the method according to the invention for producing a soft magnetic composite material with such a molding compound has the advantage over the prior art that it can be used to lower the temperature previously required when pressing the molding compound in a press tool, for example a die, and that preheating of the molding compound before pressing can be dispensed with at the same time.
- the better sliding behavior of the molding compound also advantageously allows a reduction in the proportion of the thermoplastic compound in the molding compound.
- the molding compound according to the invention enables higher material densities to be achieved for a given pressing force, and it leads to less tool wear. By not preheating the molding compound before pressing, it is also avoided that undesired oxidation, for example of iron powder, as the starting powder having soft magnetic properties, occurs.
- the method according to the invention makes it possible to dispense with pressing in the press tool under protective gas.
- the molding compound according to the invention and the method according to the invention have the advantage of simpler processing by considerably simplifying the hot-pressing device, and of lower energy expenditure during shaping.
- the production of the soft magnetic composite material or of components using this composite material advantageously takes place by uniaxial die pressing of the molding compound at temperatures below the melting temperature of the thermoplastic compound added to the molding compound, and by a subsequent, graded thermal aging process.
- the added lubricant is advantageously first evaporated or pyrolyzed at temperatures below the melting temperature of the thermoplastic compound, and then the thermoplastic compound is melted by a further increase in temperature.
- the melted thermoplastic compound wets the powder particles of the starting powder which have soft magnetic properties, and thus, after cooling, brings about an effective bonding of the powder particles, which leads to good mechanical strength and a high electrical resistance of the composite material obtained.
- the molding compound according to the invention as the starting compound for the process according to the invention for producing the soft magnetic composite material is based either on a soft magnetic powder which is surface-coated with a thermoplastic compound or, alternatively, was dry-mixed with a fine thermoplastic powder.
- the powder particles can be coated with the thermoplastic compound, for example, by adding a solution of a suitable thermoplastic polymer in a solvent.
- thermoplastic compound In the case of dry mixing of the thermoplastic compound with the soft magnetic powder, a powdery, thermoplastic compound is used, which preferably has an average grain size of 1 ⁇ m to 100 ⁇ m, in particular 5 ⁇ m to 40 ⁇ m.
- a lubricant is particularly advantageously used as a lubricant, which is heated when the molding compound is heated
- Inert gas atmosphere evaporates during the two-stage thermal aging process at temperatures below the melting point of the thermoplastic compound used, or decomposes thermally and volatilizes, neither the lubricant nor its decomposition products chemically reacting with the thermoplastic compound and / or the starting powder having soft magnetic properties.
- thermoplastic melt In order to prevent the thermoplastic melt from being expelled from the composite material under the pressure of the gases originating from the lubricant, it is furthermore very advantageous if the lubricant, after being pressed at temperatures below the melting point of the thermoplastic compound, initially at least almost completely removed from the molding compound. is removed before a further increase in temperature then causes the thermoplastic compound to melt and the soft magnetic starting powder to be wetted.
- the lubricant remains in the structure of the soft magnetic composite material obtained and there can adversely affect its usage properties.
- the lubricant is stearic acid, which also serves as a mold release agent.
- the stearic acid is advantageously added to the molding compound as a micronized powder with an average grain size of 1 ⁇ m to 100 ⁇ m, in particular of 10 ⁇ m to 50 ⁇ m.
- thermoplastic compounds polyphenylene sulfide preferably being used.
- the combination of stearic acid with polyphenylene sulfide is particularly advantageous.
- the molding compound according to the invention is free-flowing.
- the starting powder is phosphated iron powder of the ABM types or Somaloy 500 (Höganäs, Sweden) mixed with polyphenylene sulfide powder as a thermoplastic compound.
- Types V0 from Philips Petrolium
- Fortron 0205 B4 / 20 from Ticona
- Stearic acid is added to this powder mixture as a lubricant and mold release agent with an average powder grain size of approx. 30 ⁇ m.
- the lubricant stearic acid is added to the molding compound in a proportion of 0.05 mass percent to 1 mass percent, in particular 0.1 to 0.3 mass percent.
- thermoplastic compound is added to the molding compound in a proportion of 0.2 percent by mass to 10 percent by mass, in particular 0.3 to 1.5 percent by mass.
- phosphated iron powder is mixed with 0.6 mass percent polyphenylene sulfide powder and 0.2 mass percent micronized stearic acid.
- the free-flowing molding compound obtained in this way is then shaped into a component by uniaxial pressing without powder preheating at a mold temperature of 70 ° C. in a die.
- the press tool was preheated to a temperature of 70 ° C.
- a two-stage aging process follows, which comprises a first temperature treatment of the pressed molding compound or the molded component below the melting temperature of the thermoplastic compound used, and then a second temperature treatment of the pressed molding compound above the melting temperature of the thermoplastic compound.
- the first temperature treatment is carried out at a temperature of 260 ° C. under a nitrogen atmosphere for 2 hours. This is followed by the second temperature treatment at 285 ° C to 300 ° C for a period of 30 minutes.
- this lubricant volatilizes at least largely without residue during the first temperature treatment. Furthermore, this lubricant and also its decomposition products are at least largely chemically inert to the thermoplastic compound polyphenylene sulfide and the phosphated iron powder, so that no chemical reaction occurs between the lubricant and the other components of the molding compound during the temperature treatment.
- the preparation of the molding compound prior to pressing can, on the one hand, be a mixing of the iron powder having soft magnetic properties with the powdery thermoplastic compound polyphenylene sulfide and the powdery lubricant stearic acid.
- thermoplastic compound such as polyphthalamide dissolved in a solvent
- thermoplastic compound such as polyphthalamide dissolved in a solvent
- thermoplastic compound With regard to further details on the preparation of the molding compound before the actual pressing process in the pressing tool and other suitable thermoplastic compounds, see the DE 197 35 271 AI referred. In particular, it should be emphasized that polyphthalamides can also be used as the thermoplastic compound.
- iron-nickel, iron-silicon and iron-cobalt alloys are also suitable as starting powders with soft magnetic properties.
- the overall result is that powder preheating is eliminated and that the tool temperature can be significantly reduced.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Soft Magnetic Materials (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Powder Metallurgy (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001525727A JP4933711B2 (en) | 1999-09-23 | 2000-09-06 | Method for producing soft magnetic composite material |
US09/856,763 US6706206B1 (en) | 1999-09-23 | 2000-09-06 | Mouldable material and method for producing a weakly magnetic composite material therewith |
DE50016026T DE50016026D1 (en) | 1999-09-23 | 2000-09-06 | METHOD FOR PRODUCING A SOFT MAGNETIC |
EP00963959A EP1131831B1 (en) | 1999-09-23 | 2000-09-06 | Method for producing a weakly magnetic composite material from a mouldable material |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19945619A DE19945619A1 (en) | 1999-09-23 | 1999-09-23 | Press compound and method for producing a soft magnetic composite material with the press compound |
DE19945619.4 | 1999-09-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001022448A1 true WO2001022448A1 (en) | 2001-03-29 |
Family
ID=7923047
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2000/003054 WO2001022448A1 (en) | 1999-09-23 | 2000-09-06 | Mouldable material and method for producing a weakly magnetic composite material therewith |
Country Status (6)
Country | Link |
---|---|
US (1) | US6706206B1 (en) |
EP (1) | EP1131831B1 (en) |
JP (1) | JP4933711B2 (en) |
CN (1) | CN1322366A (en) |
DE (2) | DE19945619A1 (en) |
WO (1) | WO2001022448A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005064621A1 (en) * | 2003-12-29 | 2005-07-14 | Höganäs Ab | Powder composition, method for making soft magnetic components and soft magnetic composite component. |
US7153594B2 (en) | 2002-12-23 | 2006-12-26 | Höganäs Ab | Iron-based powder |
US7416578B2 (en) | 2004-09-17 | 2008-08-26 | Höganäs Ab | Powder metal composition |
US7494600B2 (en) | 2003-12-29 | 2009-02-24 | Höganäs Ab | Composition for producing soft magnetic composites by powder metallurgy |
CN109794600A (en) * | 2018-12-27 | 2019-05-24 | 中南大学 | A kind of insulating treatment method and soft magnetic materials preparation method of soft magnetic metal powder |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19945619A1 (en) | 1999-09-23 | 2001-04-19 | Bosch Gmbh Robert | Press compound and method for producing a soft magnetic composite material with the press compound |
US7998361B2 (en) | 2004-03-31 | 2011-08-16 | Sumitomo Electric Industries, Ltd. | Soft magnetic material and powder magnetic core |
JP4801734B2 (en) | 2005-06-15 | 2011-10-26 | ホガナス アクチボラゲット | Electromagnetic soft composite material |
JP4747918B2 (en) * | 2005-11-04 | 2011-08-17 | 東ソー株式会社 | Polyarylene sulfide composition |
JP5687323B1 (en) * | 2013-09-30 | 2015-03-18 | 住友理工株式会社 | Sound absorbing cover, sound absorbing assembly, and magnetic induction foam molding apparatus |
CN114231330B (en) * | 2022-01-13 | 2022-11-18 | 鞍钢股份有限公司 | High-calorific-value iron powder composite fuel and preparation method thereof |
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JPS56155510A (en) * | 1980-04-30 | 1981-12-01 | Tohoku Metal Ind Ltd | Metal dust magnetic core |
JPH0444304A (en) * | 1990-06-12 | 1992-02-14 | Sumitomo Bakelite Co Ltd | Plastic magnetic composition |
EP0760523A1 (en) * | 1995-09-04 | 1997-03-05 | SIEMENS MATSUSHITA COMPONENTS GmbH & CO. KG | Process for manufacturing forms by pressing a ferrite granulat |
EP0977216A1 (en) * | 1998-07-29 | 2000-02-02 | TDK Corporation | Ferromagnetic powder for dust cores, dust core, and dust core fabrication process |
US6039784A (en) * | 1997-03-12 | 2000-03-21 | Hoeganaes Corporation | Iron-based powder compositions containing green strength enhancing lubricants |
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DE761191C (en) * | 1941-11-29 | 1954-04-22 | Siemens & Halske A G | Process for the production of mass cores by spraying a magnetic powder, e.g. B. iron powder, and an insulating material such as polystyrene, existing injection molding compound, especially for the purposes of high-frequency technology |
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DE2122977C3 (en) * | 1971-05-10 | 1975-06-19 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Switching magnet made of silicon-containing iron powder, manufactured in a pressing and sintering process |
JPS5364797A (en) * | 1976-11-24 | 1978-06-09 | Tdk Corp | Rubber, plastic magnet and magnetic powder for them |
DD204566A1 (en) * | 1982-02-16 | 1983-11-30 | Adw Ddr | SUPERPARAMAGNETIC MASSES AND WAFER DISPERSIONS WITH SUPERPARAMAGNETIC MASS PARTICLES |
JPS6169866A (en) * | 1984-09-12 | 1986-04-10 | Polyplastics Co | Composite material composition |
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EP0452580B1 (en) * | 1990-04-19 | 1999-06-23 | Seiko Epson Corporation | A resin bound magnet and its production process |
US5105120A (en) * | 1989-08-01 | 1992-04-14 | Mitsubishi Denki Kabushiki Kaisha | Deflection yoke having a ferrite-containing plastic composition |
EP0592672A4 (en) * | 1992-04-24 | 1994-09-14 | Tdk Corp | Method of producing anisotropic ferrite magnet, anisotropic ferrite magnet, hexagonal ferrite particles, and method for producing them |
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DE19735271C2 (en) * | 1997-08-14 | 2000-05-04 | Bosch Gmbh Robert | Soft magnetic, mouldable composite material and process for its production |
DE19945619A1 (en) | 1999-09-23 | 2001-04-19 | Bosch Gmbh Robert | Press compound and method for producing a soft magnetic composite material with the press compound |
-
1999
- 1999-09-23 DE DE19945619A patent/DE19945619A1/en not_active Ceased
-
2000
- 2000-09-06 JP JP2001525727A patent/JP4933711B2/en not_active Expired - Fee Related
- 2000-09-06 DE DE50016026T patent/DE50016026D1/en not_active Expired - Lifetime
- 2000-09-06 CN CN00802030A patent/CN1322366A/en active Pending
- 2000-09-06 EP EP00963959A patent/EP1131831B1/en not_active Expired - Lifetime
- 2000-09-06 US US09/856,763 patent/US6706206B1/en not_active Expired - Fee Related
- 2000-09-06 WO PCT/DE2000/003054 patent/WO2001022448A1/en active Application Filing
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JPS56155510A (en) * | 1980-04-30 | 1981-12-01 | Tohoku Metal Ind Ltd | Metal dust magnetic core |
JPH0444304A (en) * | 1990-06-12 | 1992-02-14 | Sumitomo Bakelite Co Ltd | Plastic magnetic composition |
EP0760523A1 (en) * | 1995-09-04 | 1997-03-05 | SIEMENS MATSUSHITA COMPONENTS GmbH & CO. KG | Process for manufacturing forms by pressing a ferrite granulat |
US6039784A (en) * | 1997-03-12 | 2000-03-21 | Hoeganaes Corporation | Iron-based powder compositions containing green strength enhancing lubricants |
EP0977216A1 (en) * | 1998-07-29 | 2000-02-02 | TDK Corporation | Ferromagnetic powder for dust cores, dust core, and dust core fabrication process |
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Title |
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DATABASE WPI Section Ch Week 198201, Derwent World Patents Index; Class A21, AN 1982-00897E, XP002155837 * |
PATENT ABSTRACTS OF JAPAN vol. 016, no. 230 (E - 1208) 27 May 1992 (1992-05-27) * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7153594B2 (en) | 2002-12-23 | 2006-12-26 | Höganäs Ab | Iron-based powder |
WO2005064621A1 (en) * | 2003-12-29 | 2005-07-14 | Höganäs Ab | Powder composition, method for making soft magnetic components and soft magnetic composite component. |
AU2004309770B2 (en) * | 2003-12-29 | 2008-05-22 | Hoganas Ab | Powder composition, method for making soft magnetic components and soft magnetic composite component. |
US7494600B2 (en) | 2003-12-29 | 2009-02-24 | Höganäs Ab | Composition for producing soft magnetic composites by powder metallurgy |
US8092615B2 (en) | 2003-12-29 | 2012-01-10 | Höganäs Ab | Composition for producing soft magnetic composites by powder metallurgy |
US7416578B2 (en) | 2004-09-17 | 2008-08-26 | Höganäs Ab | Powder metal composition |
CN109794600A (en) * | 2018-12-27 | 2019-05-24 | 中南大学 | A kind of insulating treatment method and soft magnetic materials preparation method of soft magnetic metal powder |
Also Published As
Publication number | Publication date |
---|---|
US6706206B1 (en) | 2004-03-16 |
EP1131831A1 (en) | 2001-09-12 |
JP2003510460A (en) | 2003-03-18 |
DE19945619A1 (en) | 2001-04-19 |
DE50016026D1 (en) | 2010-12-23 |
JP4933711B2 (en) | 2012-05-16 |
EP1131831B1 (en) | 2010-11-10 |
CN1322366A (en) | 2001-11-14 |
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